Mac Tonight was McDonald's moon-faced mascot introduced in 1986.
The character appeared in a campaign aimed at promoting McDonald's as an evening dining option. Mac Tonight wore formal evening clothing, played on the phrase “tonight,” and was associated with a version of “Mack the Knife.” His crescent-moon head made him visually distinct from Ronald McDonald and the McDonaldland characters.
Mac Tonight became a recognizable part of McDonald's advertising in the late 1980s, although the campaign was later discontinued. The character is especially associated with the United States and with the period when McDonald's was using specialized mascots and musical advertising to broaden the restaurant's appeal.
Mac Tonight is often confused with Mayor McCheese or Grimace because all appeared in McDonald's advertising. Unlike those characters, Mac Tonight was designed around nighttime dining and had a moon-shaped face.